C、第二次段考進退步R語言輸出結果

## Warning: Removed 2 rows containing non-finite values (`stat_count()`).

## Warning: Removed 1 rows containing missing values (`geom_text()`).

## Warning: Removed 1 rows containing missing values (`geom_text()`).

## Warning: Removed 1 rows containing non-finite values (`stat_count()`).

## Warning: Removed 1 rows containing non-finite values (`stat_count()`).